1|Page
Minneapolis Journeyman Plumber with Gas (498-MN-
MI) Contractor Exam | Latest Verified Questions and
Detailed Answers | Graded A+
OVERVIEW DESCRIPTION:
This comprehensive question bank was developed specifically for candidates preparing for the
Minneapolis Journeyman Plumber with Gas (498-MN-MI) Contractor Exam. The 300 multiple-
choice questions rigorously follow the official exam weighting, with concentrated emphasis on
Fuel Gas – General Regulations (20%), Gas Piping (15%), and Fuel Gas – Venting (15%), while
fully covering Plumbing General Knowledge (12%), General Regulations (10%), Backflow
Prevention (8%), and the remaining fixture, water supply, DWV, and roof drain categories. Each
question incorporates the specific Minnesota Plumbing Code amendments (Chapter 4714),
Minneapolis Certificate of Competency requirements, and local municipal interpretations from
Saint Paul, Chanhassen, and other jurisdictions. The format provides the correct answer with a
checkmark, followed by a concise, one-to-two-sentence expert rationale citing the applicable
code section or rule, enabling efficient, targeted exam preparation.
QUESTION 1
According to Minnesota Rules Chapter 4714, what is the maximum allowable pressure
for a low-pressure hot water boiler connected to a single-wall heat exchanger to
protect the potable water system?
A) 15 psig
B) 30 psig
C) 50 psig
D) 80 psig
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: Minnesota amended UPC 603.5.4.1 to limit single-wall heat
exchangers to boilers with a maximum pressure of 30 psig to prevent contamination of
the potable supply.
QUESTION 2
A journeyworker plumber in Minneapolis installing gas piping must hold which
prerequisite credential to qualify for the City’s Certificate of Competency exam?
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A) A National Institute for Certification in Engineering Technologies (NICET)
certification
B) A state plumbing license at a trade level equal to the exam being applied for
C) An OSHA 30-Hour Construction card
D) A Certified Backflow Tester license
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: The City requires applicants for the Plumbing/Gas Specific exam
to possess a Minnesota state plumbing license in the corresponding trade level
(Journeyworker) plus specific gas education.
QUESTION 3
What is the minimum separation distance required for a freeze-proof yard hydrant
(installed underground) from any sewer or similar source of contamination?
A) 5 feet
B) 10 feet
C) 15 feet
D) 25 feet
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: Minnesota Rule 4714.0603 requires underground freeze-proof
hydrants to be located at least ten feet from any sewer to prevent contamination from
drainage.
QUESTION 4
Which edition of the Uniform Plumbing Code (UPC) is currently the basis for the
Minnesota State Plumbing Code as adopted by the Minnesota Department of Labor and
Industry?
A) 2015 UPC
B) 2018 UPC
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C) 2021 UPC
D) 2024 UPC
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: The 2020 Minnesota State Plumbing Code is based on the 2018
Uniform Plumbing Code with specific Minnesota amendments.
QUESTION 5
An unlisted gas appliance with an input rating of 10,000,000 Btu/hr must have its fuel
gas train and safety devices installed in accordance with which standard under
Minnesota Fuel Gas Code?
A) NFPA 54-2009 only
B) ASME CSD-1-2006
C) NFPA 85-2007
D) ANSI Z21.1
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: For unlisted appliances under 12,500,000 Btu/hr, Minnesota
amends IFGC 301.3 to require compliance with ASME CSD-1-2006 for fuel gas trains
and safety controls .
QUESTION 6
What is the maximum time frame allowed to notify the public water supplier following
the installation of a testable backflow prevention assembly on a community public
water system in Minnesota?
A) 10 days
B) 14 days
C) 30 days
D) 45 days
CORRECT ANSWER: C ✓ ✓
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EXPERT RATIONALE: Minnesota Rules require that the public water supplier be notified
within 30 days following the installation of a testable backflow preventer on a
community system .
QUESTION 7
What is the minimum general liability insurance coverage required for a Master
Plumber licensed in Minnesota?
A) $100,000
B) $250,000
C) $500,000
D) $1,000,000
CORRECT ANSWER: C ✓ ✓
EXPERT RATIONALE: Minnesota statutes require master plumbers to maintain general
liability insurance with a minimum coverage of $500,000 .
QUESTION 8
When sizing a sanitary drainage system, the term effective opening refers to:
A) The diameter of the vent termination
B) The cross-sectional area that governs the hydraulic capacity of a fixture drain
C) The unobstructed area of a water supply valve
D) The clear opening of a floor drain strainer
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: The Minnesota Plumbing Code defines effective opening as the
specific cross-sectional area of a fixture's drain used to determine flow capacity for
system sizing .
QUESTION 9
A vent pipe extending through a roof must be increased to the next nominal pipe size if
the length exceeds which value?
Minneapolis Journeyman Plumber with Gas (498-MN-
MI) Contractor Exam | Latest Verified Questions and
Detailed Answers | Graded A+
OVERVIEW DESCRIPTION:
This comprehensive question bank was developed specifically for candidates preparing for the
Minneapolis Journeyman Plumber with Gas (498-MN-MI) Contractor Exam. The 300 multiple-
choice questions rigorously follow the official exam weighting, with concentrated emphasis on
Fuel Gas – General Regulations (20%), Gas Piping (15%), and Fuel Gas – Venting (15%), while
fully covering Plumbing General Knowledge (12%), General Regulations (10%), Backflow
Prevention (8%), and the remaining fixture, water supply, DWV, and roof drain categories. Each
question incorporates the specific Minnesota Plumbing Code amendments (Chapter 4714),
Minneapolis Certificate of Competency requirements, and local municipal interpretations from
Saint Paul, Chanhassen, and other jurisdictions. The format provides the correct answer with a
checkmark, followed by a concise, one-to-two-sentence expert rationale citing the applicable
code section or rule, enabling efficient, targeted exam preparation.
QUESTION 1
According to Minnesota Rules Chapter 4714, what is the maximum allowable pressure
for a low-pressure hot water boiler connected to a single-wall heat exchanger to
protect the potable water system?
A) 15 psig
B) 30 psig
C) 50 psig
D) 80 psig
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: Minnesota amended UPC 603.5.4.1 to limit single-wall heat
exchangers to boilers with a maximum pressure of 30 psig to prevent contamination of
the potable supply.
QUESTION 2
A journeyworker plumber in Minneapolis installing gas piping must hold which
prerequisite credential to qualify for the City’s Certificate of Competency exam?
,2|Page
A) A National Institute for Certification in Engineering Technologies (NICET)
certification
B) A state plumbing license at a trade level equal to the exam being applied for
C) An OSHA 30-Hour Construction card
D) A Certified Backflow Tester license
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: The City requires applicants for the Plumbing/Gas Specific exam
to possess a Minnesota state plumbing license in the corresponding trade level
(Journeyworker) plus specific gas education.
QUESTION 3
What is the minimum separation distance required for a freeze-proof yard hydrant
(installed underground) from any sewer or similar source of contamination?
A) 5 feet
B) 10 feet
C) 15 feet
D) 25 feet
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: Minnesota Rule 4714.0603 requires underground freeze-proof
hydrants to be located at least ten feet from any sewer to prevent contamination from
drainage.
QUESTION 4
Which edition of the Uniform Plumbing Code (UPC) is currently the basis for the
Minnesota State Plumbing Code as adopted by the Minnesota Department of Labor and
Industry?
A) 2015 UPC
B) 2018 UPC
,3|Page
C) 2021 UPC
D) 2024 UPC
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: The 2020 Minnesota State Plumbing Code is based on the 2018
Uniform Plumbing Code with specific Minnesota amendments.
QUESTION 5
An unlisted gas appliance with an input rating of 10,000,000 Btu/hr must have its fuel
gas train and safety devices installed in accordance with which standard under
Minnesota Fuel Gas Code?
A) NFPA 54-2009 only
B) ASME CSD-1-2006
C) NFPA 85-2007
D) ANSI Z21.1
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: For unlisted appliances under 12,500,000 Btu/hr, Minnesota
amends IFGC 301.3 to require compliance with ASME CSD-1-2006 for fuel gas trains
and safety controls .
QUESTION 6
What is the maximum time frame allowed to notify the public water supplier following
the installation of a testable backflow prevention assembly on a community public
water system in Minnesota?
A) 10 days
B) 14 days
C) 30 days
D) 45 days
CORRECT ANSWER: C ✓ ✓
, 4|Page
EXPERT RATIONALE: Minnesota Rules require that the public water supplier be notified
within 30 days following the installation of a testable backflow preventer on a
community system .
QUESTION 7
What is the minimum general liability insurance coverage required for a Master
Plumber licensed in Minnesota?
A) $100,000
B) $250,000
C) $500,000
D) $1,000,000
CORRECT ANSWER: C ✓ ✓
EXPERT RATIONALE: Minnesota statutes require master plumbers to maintain general
liability insurance with a minimum coverage of $500,000 .
QUESTION 8
When sizing a sanitary drainage system, the term effective opening refers to:
A) The diameter of the vent termination
B) The cross-sectional area that governs the hydraulic capacity of a fixture drain
C) The unobstructed area of a water supply valve
D) The clear opening of a floor drain strainer
CORRECT ANSWER: B ✓ ✓
EXPERT RATIONALE: The Minnesota Plumbing Code defines effective opening as the
specific cross-sectional area of a fixture's drain used to determine flow capacity for
system sizing .
QUESTION 9
A vent pipe extending through a roof must be increased to the next nominal pipe size if
the length exceeds which value?
